Fastening tool



FIG. 1 is a perspective view thereof;

FIG. 2 is an alternative perspective view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken-line disclosure in the views represents portions of the article in which the claimed design is embodied, but which form no part of the claimed design. 

The ornamental design for a fastening tool, as shown and described. 